4-Point beam tensile test on a soft adhesive

Michal Budzik; Julien Jumel; Martin Shanahan

doi:10.1016/j.matdes.2012.10.011

4-Point beam tensile test on a soft adhesive

Abstrakt

An adhesive butt joint with a soft bondline has been studied. A series of experiments was conducted on test pieces constituted of aluminium adherends bonded with a low modulus epoxy adhesive, ScotchWeld™ 2216. The joint was subjected to four point bending, in tension/compression loading, under constant deflection rate, with the bondline being parallel to the applied load. The objective was to examine and evaluate crack nucleation for a range of adhesive layer thicknesses. Three criteria were used to evaluate joint efficiency. Firstly, force/stress at crack onset revealed that thinner bondlines were preferable to produce stronger and stiffer bonded structures. Secondly, fracture energy was derived, which, in the presentconfiguration, is associated with the energy stored within the adhesive layer, rather than the substrates. This is one of originalities of the test proposed. Fracture energy data lead to the conclusion, that more energy is dissipated by the joints with lower effective rigidity, viz. thicker bondlines. Finally,we applied a criterion of non-linear, 'pragmatic' work of adhesion - similar to the J-integral approach.In terms of energy consumption, the third criterion yielded (quasi) independence of the adhesive thickness. From the data collected, we conclude that for optimal joint design, rate effects must be carefullytaken into account.

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Kategoria:: Publikacja w czasopiśmie
Typ:: artykuł w czasopiśmie wyróżnionym w JCR
Opublikowano w:: MATERIALS & DESIGN nr 46, strony 134 - 141,
ISSN: 0264-1275
Język:: angielski
Rok wydania:: 2013
Opis bibliograficzny:: Budzik M., Jumel J., Shanahan M.: 4-Point beam tensile test on a soft adhesive// MATERIALS & DESIGN. -Vol. 46, (2013), s.134-141
DOI:: Cyfrowy identyfikator dokumentu elektronicznego (otwiera się w nowej karcie) 10.1016/j.matdes.2012.10.011
Weryfikacja:: Politechnika Gdańska